Answer: 0.6
Step-by-step explanation:
First you must calculate the mean of the data
The average is:
[tex]{\displaystyle {\overline {x}}}=\frac{11 +10 +9 +12 +10}{5}\\\\{\displaystyle {\overline {x}}}=10.4[/tex]
Now you must calculate the difference between the value 11 and the average
[tex]d = |11-{\displaystyle {\overline {x}}}|\\\\d=|11-10.4|\\\\d=|0.6|\\\\d=0.6[/tex]
The mean absolute deviation is 0.6